Method for preparing nanometer silicon conductive polymer composite material for lithium ion batteries

A conductive polymer and lithium-ion battery technology, applied in nanotechnology, battery electrodes, and nanotechnology for materials and surface science, can solve problems such as sudden decrease in specific capacity, large volume effect, and damage to the microstructure of materials. Achieve the effects of improving conductivity, simple preparation process, and good charge-discharge cycle performance

Inactive Publication Date: 2014-11-19
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume effect is large (more than 300%) during the charging and discharging process, which causes the destruction of the material microstructure and the specific capacity drops sharply.

Method used

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  • Method for preparing nanometer silicon conductive polymer composite material for lithium ion batteries
  • Method for preparing nanometer silicon conductive polymer composite material for lithium ion batteries
  • Method for preparing nanometer silicon conductive polymer composite material for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 0.7500g of nano-silica powder and 0.5143g of sodium p-toluenesulfonate into 250mL of deionized water; dissolve 0.3141g of pyrrole and 0.4359g of aniline in 50mL of absolute ethanol and add them to the above mixture, adjust with 1mol / L hydrochloric acid pH=2, put it into an ultrasonic apparatus for ultrasonic dispersion for 1h, switch to electric stirring, and the stirring speed is 300r / min; weigh 6.4133g (NH 4 ) 2 S 2 o 8 Dissolve in 100mL deionized water, adjust the pH to 2 with 1mol / L hydrochloric acid, slowly add the ammonium persulfate solution into the mixture using a peristaltic pump (30min to complete), then oxidize and polymerize at room temperature for 4h. The suspension was filtered with suction, washed three times with absolute ethanol, and several times with a large amount of deionized water, then vacuum-dried at 60°C for 12 hours, and ground to obtain a nano-silicon conductive polymer composite material.

[0041] Weigh 0.2800g nano-silicon conductive...

Embodiment 2

[0043] Add 0.7508g of nano-silica powder and 0.3429g of sodium p-toluenesulfonate into 250mL of deionized water; dissolve 0.2094g of pyrrole and 0.2906g of aniline in 50mL of absolute ethanol and add them to the above mixture, adjust with 1mol / L hydrochloric acid pH=2, put it into the ultrasonic apparatus for ultrasonic dispersion for 1h, switch to electric stirring, and the stirring speed is 300r / min; weigh 4.2751g (NH 4 ) 2 S 2 o 8 Dissolve in 100mL deionized water, adjust the pH to 2 with 1mol / L hydrochloric acid, slowly add the ammonium persulfate solution into the mixture using a peristaltic pump (30min to complete), then oxidize and polymerize at room temperature for 4h. The suspension was filtered with suction, washed three times with absolute ethanol, and several times with a large amount of deionized water, then vacuum-dried at 60°C for 12 hours, and ground to obtain a nano-silicon conductive polymer composite material.

[0044] Weigh 0.2450g nano-silicon conductiv...

Embodiment 3

[0046] Add 0.7510g of nano-silica powder and 0.7715g of sodium p-toluenesulfonate into 250mL of deionized water; dissolve 0.4712g of pyrrole and 0.6539g of aniline in 50mL of absolute ethanol and add them to the above mixture, adjust with 1mol / L hydrochloric acid pH = 2, put it into an ultrasonic apparatus for ultrasonic dispersion for 1 hour, switch to electric stirring, and the stirring speed is 300r / min; weigh 9.6209g (NH 4 ) 2 S 2 o 8 Dissolve in 100mL deionized water, adjust the pH to 2 with 1mol / L hydrochloric acid, slowly add the ammonium persulfate solution into the mixture using a peristaltic pump (30min to complete), then oxidize and polymerize at room temperature for 4h. The suspension was filtered with suction, washed three times with absolute ethanol, and several times with a large amount of deionized water, then vacuum-dried at 60°C for 12 hours, and ground to obtain a nano-silicon conductive polymer composite material.

[0047] Weigh 0.2810g nano silicon cond...

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Abstract

The invention provides a nanometer silicon conductive polymer composite material, belonging to the technical field of lithium ion batteries. According to the nanometer silicon conductive polymer composite material, a silicon-based composite material is prepared by in-situ polymerization according to a chemical oxidation method in which silicon nanoparticles is used as an active substance, pyrrole and phenylamine are used as monomers, water is as a reaction solvent, p-methylbenzene sulfonic acid and absolute ethyl alcohol are used as dispersing agents, ammonium persulfate is used as oxidant and diluted hydrochloric acid is used as a protonic acid doping agent, the silicon-based composite material is of a core-shell structure in which silicon nanoparticles are uniformly coated with conductive polypyrrole-phenylamine, the core silicon nanoparticles have the lithium storage activity, and due to conductive polypyrrole-phenylamine of the shell, the conductivity of the silicon-based material is remarkably improved. Therefore, as a cathode material of the lithium ion battery, the composite material is relatively good in charge / discharge circulation property. In addition, the composite material provided by the invention is simple in preparation process, is prepared from easily available raw materials, is safe and environment-friendly and has a great commercial prospect in production of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to a silicon-based material used for negative electrode materials of lithium-ion batteries; in particular, it relates to a nano-silicon conductive polymer composite material and a preparation method thereof. Background technique [0002] In the 21st century, the energy crisis has attracted more and more people's attention. Conventional energy oil not only has limited reserves, but also seriously pollutes the environment. It is imminent to find a new type of power source. In recent years, secondary lithium batteries have caused a research boom of scientists. The microstructure of electrode materials is the main factor affecting the electrochemical performance of lithium-ion batteries. At present, the commercial lithium-ion battery anode material is mainly graphite, but its theoretical specific capacity is low (372 mAh / g), which cannot meet the needs of high-power electri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M4/38B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/624H01M10/0525Y02E60/10
Inventor 王庆涛李瑞荣俞栋周小中李健雷自强
Owner NORTHWEST NORMAL UNIVERSITY
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